A brake disc for a wheeled vehicle; said brake disc including opposing annular braking surfaces; each of said surfaces provided with an identical pattern of disparate arcuate groove segments; said groove segments arranged in groups oriented in both clockwise and anti-clockwise directions; each of said groups including, one series of at least two arcuate groove segments lying along a common arc extending from proximate a hub of said braking surface to proximate the periphery of said braking surface, one inward arcuate groove segment extending from proximate said hub to a point intermediate said hub and said periphery, and one outward arcuate groove segment extending from a point intermediate said hub and said periphery to proximate said periphery.